Pipe construction



y 7 1935 G. A. MAGUIRE PIPE CONSTRUCTION Filed Aug. 9, 1955 Patented May 5, 1936 ili llTED STATES PATENT ()FFIQE.

PIPE CON Garnet Adam Ma STRUCTION guire, St. John, New

Brunswick, Canada 1 Claim.

This invention relates to pipe construction and more particularly to a type of construction which will facilitate the cutting of the pipe into suitable lengths or at desired points.

It has been usual to cut pipe, such as black and galvanized pipe, etc. with a cutting member employing a cutting disc, by screwing the cutter tightly against the pipe so that the disc bites into the surface of the pipe whereupon the cutter is rotated about the pipe preliminarily to make a groove. After the groove has been formed, oil may be placed in it for facilitating the cutting operation. This conventional method can be greatly improved upon since it presents considerable difiiculty particularly in the case of a pipe which has a chilled surface which makes it quite difficult to force the cutting disc to penetrate the hard chilled surface so that it has to be forced against the pipe under considerable pressure. Moreover, it is not possible to make the first preliminary cuts in oil since, if oil is placed on the surface of the pipe, it would simply run off. Thus oil can only be applied after a preliminary groove has been cut.

It is therefore an object of the present invention to provide a new type of pipe structure which will permit preliminary cutting in oil and will obviate the necessity of applying heavy pressure on the cutting disc to force it to bite into the chilled surface of the pipe.

A further object of the invention is to provide a pipe structure which can be produced without any difficult and which will readily permit an easy oscillating movement of the cutter which will further facilitate the cutting operation.

A further object of the invention is to provide a pipe structure, any given length of which can be readily judged to determine immediately the point at which it is desired to mount the cutting tool.

With these and other objects in View the invention consists in providing a recess in the outer surface of the pipe positioned at predetermined points on the pipe, to receive the cutting disc of the pipe cutter and provide for a ready biting of the cutting disc into the uncut chilled surface and also permitting preliminary cuts in oil, the oil being held in the recess, as more fully described in the following specification and illustrated in the accompanying drawing which forms part of the same.

In the drawing:-

Figure 1 is a fragmentary perspective view of a piece of pipe, showing the recesses in its surface.

Figure 2 is a transverse section taken through a piece of pipe at the point where a recess is formed, illustrating a pipe cutter mounted on the pipe with the cutting disc in the recess.

Figure 3 is an enlarged detail section taken transversely through a recess.

Referring more particularly to the drawing, l indicates a piece of pipe which according to the present invention is recessed as at H, the recess being preferably V-shaped as shown in Figure 3 to coincide with the cutter, and of a suitable length, preferably just slightly longer than the width of the average cutting disc. This will therefore permit a cutting disc l2, as shown in Figure 2, to enter into the recess and provide for suflicient play so that the cutter structure l3 can be oscillated backwards and forwards to provide for easy cutting of the pipe.

As shown in Figure 2 by the broken lines A and B, the cutter is oscillated back and forth from its central position approximately tothese lines until the cutting disc 12 has cut into the adjacent outer surface of the pipe whereupon the arc of movement of the cutter is widened until finally the cutter is completely rotated around the pipe forming a preliminary cut or groove of the depth of the recess II. The cutting disc I2 is brought into contact pipe under pressure by means of a suitable adjusting or tightening shank l4 and after the preliminary groove has been formed completely around the pipe, this shank is turned to force the cutter further into the pipe and so on until the pipe is cut completely through, according to usual practice.

The recess 1 l is preferably formed with straight end walls l5 preferably radially disposed with respect to the pipe centre, so as to provide an edge into which the cutter will readily bite, and having regard to this formation and the fact that the cutter can be freely oscillated backwards and forwards so that it gains momentum with each swing, it is readily apparent that the cutting operation is a comparatively simple one. Moreover, it is apparent that the cutting operation is further facilitated through the possibility of using oil for the preliminary cutting, the recess providing in effect an oil well for the preliminary cutting of the hardened surface of the pipe. The recesses are preferably formed in the pipe surface in a given line and spaced apart a desired distance but it is apparent that the recesses could be staggered if desired or placed in any other desired arrangement. The distance between each recess might be approximately two inches and if the length of pipe required did not coincide with the position of one of the recesses the pipe could be cut at the nearest recess and a suitable fitting provided to make the connection where necessary.

By placing the recesses in the same area, that is, in a, given line throughout the length of the pipe, the recesses can serve a further function which is extremely useful and that is to provide a direct indication as to the length of the pipe. In other words the recesses would serve in a similar manner to the markings on a yardstick and being spaced apart a definite distance they would readily indicate quite accurately the length of the pipe or readily assist one in arriving at a given length to be cut from a long section of pipe. Of course certain of the recesses could be made a little longer than others, suchas indicated at 16. For instance, the recess occurring every six inches could be made longer so that one could easily calculate the length of a given section of pipe immediately.

A further advantage of the recesses is that they are placed directly at right angles to the longitudinal axis of the pipe and consequently the pipe may be cut 011 accurately at a right angle to the length, thus avoiding any possibility a direction circumferentially of the pipe and while the disc is rotating.

' GARNET ADAM MAGUIRE. 

